Eco-friendly bifunctional antibacterial and anticorrosive broad-spectrum rosin thiourea iminazole quaternary ammonium salt against microbiologically influenced corrosion.

Bifunctional antibacterial and anticorrosive broad-spectrum rosin thiourea iminazole quaternary ammonium salt (RTIQAS) was investigated to inhibit microbiologically influenced corrosion (MIC) caused by anaerobic gram-negative sulfate reducing bacterium (SRB) Desulfovibrio vulgaris against X80 carbon steel and aerobic gram-positive bacterium Bacillus licheniformis against 316L stainless steel. It also indicated that RTIQAS was more effective than common commercial biocides THPS (tetrakis hydroxymethyl phosphonium sulfate) and glutaraldehyde at the same concentration against X80 carbon steel corrosion by D. vulgaris. In the molecular simulation, the interaction energy confirmed the favorable adsorption of RTIQAS on the metal surfaces, indicating its potential as an effective corrosion inhibitor. • A bifunctional antibacterial and anticorrosive inhibitor RTIQAS was synthesized. • RTIQAS had antibacterial performances against anaerobic Desulfovibrio vulgaris on X80 carbon steel. • RTIQAS presented antibacterial abilities against aerobic Bacillus licheniformis on 316 L stainless steel. • RTIQAS showed better inhibition effect than two common commercial biocides against D. vulgaris. • RTIQAS molecules were adsorbed on iron surface based on molecular [ABSTRACT FROM AUTHOR]